US3828187A - Coherent-optical image converter - Google Patents

Coherent-optical image converter Download PDF

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Publication number
US3828187A
US3828187A US00369157A US36915773A US3828187A US 3828187 A US3828187 A US 3828187A US 00369157 A US00369157 A US 00369157A US 36915773 A US36915773 A US 36915773A US 3828187 A US3828187 A US 3828187A
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US
United States
Prior art keywords
image
cathode
incoherent
crystal layer
coherent
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Expired - Lifetime
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US00369157A
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English (en)
Inventor
G Winzer
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Siemens AG
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Siemens AG
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Filing date
Publication date
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J31/00—Cathode ray tubes; Electron beam tubes
    • H01J31/08—Cathode ray tubes; Electron beam tubes having a screen on or from which an image or pattern is formed, picked up, converted, or stored
    • H01J31/50—Image-conversion or image-amplification tubes, i.e. having optical, X-ray, or analogous input, and optical output
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/03—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on ceramics or electro-optical crystals, e.g. exhibiting Pockels effect or Kerr effect
    • G02F1/0333—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on ceramics or electro-optical crystals, e.g. exhibiting Pockels effect or Kerr effect addressed by a beam of charged particles

Definitions

  • An electro-optical crystalline coating is arranged on the anode and is provided with a dielectric mirror coating and with a device for the external illumination of the electro-optical crystalline coating with a planepolarized laser light beam. The light beam, after passing through the crystalline layer is rotated in its direction of polarization and after passing through a subse' quent analyzer is intensity modulated.
  • the cathode is a planar photo cathode on which the incoherent image may be formed, which for all image points is directly and in parallel transferable onto the electro-optical crystalline coating.
  • This invention relates to an image converter tube for direct time conversion of an incoherent image into a coherent image, and more particularly to such an image converter tube having a photo cathode, an electron optic, and a transparent planar anode which is carried on the viewing screen.
  • the anode has arranged thereon an electro-optical crystalline coating which is of matched filtering. The'sign recognition process is frequently rendered more difficult, due to vheterodyning of interference signals.
  • the information content of blips must, as compared with strong interference signals, be emphasized or underscored by means of a properly phased addition of several blips.
  • signal memories having a high storage capacity and a high recording and erasing speed are necessary.
  • the stored information is, for example, fed to a coherent optical analog computer'for evaluation.
  • a known simple image converter is a diapositive or a photo chromatic film which is, first of all, illuminated with the light of the incoherent image, and is then brought into a coherent beam path.
  • photographic films of course, an additional development process is necessary.
  • a plane-polarized light beam, which passes through the crystal, is turned in its direction of polarization as a function of the field distribution, and is intensity modulated after passing through an analyzer which withstands the transmission intensity as a function of the angle of rotation of the direction of polarization.
  • the above object is realized in accordance with in-, vemion hrou h th P i n of a P ana P ata hode for the image converter tube, on which cathode the incoherent image is formed, which for all images points is directly and in parallel transferrable onto an electrooptical crystalline coating.
  • a light conductor optic In front of the photo cathode a light conductor optic is advantageously arranged.
  • the light conductor optic images on the photo cathode all partial ranges of the information carrying bundle of light beams.
  • the image converter can, for the arriving image, be connected with a receiving am
  • the electron optic is, in particular, developed in such a way that the electron emission from the photo cathode directly generates on the electro optical crystalline coating a charge profile which is dependent on the dist lb lt on of intensity of the image beam.
  • the arriving incoherent images intended for the coherent optical image conversion are of weak intensity, then, in particular, the image impinging upon the photo cathode, can be amplified for increased intensity by means of an additional image amplifier.
  • FIG. I is a schematic representation of a fundamental arrangement of a coherent optical image converter constructed in accordance with the principles of the present invention.
  • FIG. 2 illustrates an image converter having an image a i r R rr n to. 1, n i he n bundl of lig beams l, which is intensity modulated over its cross section, impinges upon a receiving optic 2 which is rot t d. in he di e ibn f h ri i bundle f beam 1.
  • the image in the receiving optic 2 is imaged by way of a fibre bun le i h uide 3 Onto a phqtd' athqds 4, wh h forms pan o an.
  • the image tube 5 contains, next to the photo cathode an s r n p ic wh h ma e h cur en densi y m d i a l ro b ams hi a e emitted fr m th sham c th nt a P ta m d hydr ssii Ph hate y l
  • a coherent bundle of light beams is plane polarized in a polarizer 12, and is directed by means of a semipermeable mirror 13 toward the image tube 5.
  • the coherent group of light beams (10, 11) penetrates through a window 14, the transparent anode 9, and by means of reflection on a dielectric mirror coating 15, the electro optical crystal 7 twice before it impinges, after having passed through the semipermeable mirror 13, upon an analyzer 16 which transmits light only, the polarization direction of which is perpendicular to the direction of the light beam generated by the polarizer 12.
  • FIG. 2 illustrates the image tube 5, illustrated in FIG. 1, at which an image converter 17 is directly connected between the fibre optic 3 and the tube 5.
  • the image amplifier 17 is connected with the receiver optic 2 by way of the fibre optic 3.
  • a bundle of light beams 1 having a weak intensity may therefore be amplified prior to the coherent optical conversion set forth with respect to the apparatus illustrated in FIG. 1.
  • An image converter tube for registering rapidly changing processes in a coherent optical analog computer for direct time conversion of an incoherent image into a coherent image
  • a photo cathode for receiving an incoherent light beam and generating electron emission corresponding to an incoherent image
  • a viewing screen a transparent planar anode mounted on said viewing screen
  • an electron optic for imaging the emission of said photo cathode
  • an electrical optical crystal layer mounted on said anode, a dielectric mirror coating on said crystal layer, said crystal layer receiving the emission from said cathode and providing in response thereto together with a high potential on said anode an image dependent field distribution which causes an image dependent charge distribution on the surface of said crystal facing said cathode
  • means for externally illuminating the electrical optical crystal with a linear polarized laser light beam which, after passing through said electrical optical crystal layer, is rotated in its direction of polarization, and analyzer means for intensity modulating the rotated beam
  • said cathode being a planar photo cathode on

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Holo Graphy (AREA)
  • Image-Pickup Tubes, Image-Amplification Tubes, And Storage Tubes (AREA)
  • Transforming Electric Information Into Light Information (AREA)
  • Measurement Of Radiation (AREA)
US00369157A 1972-06-30 1973-06-12 Coherent-optical image converter Expired - Lifetime US3828187A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2232247A DE2232247A1 (de) 1972-06-30 1972-06-30 Kohaerentoptischer bildwandler

Publications (1)

Publication Number Publication Date
US3828187A true US3828187A (en) 1974-08-06

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ID=5849355

Family Applications (1)

Application Number Title Priority Date Filing Date
US00369157A Expired - Lifetime US3828187A (en) 1972-06-30 1973-06-12 Coherent-optical image converter

Country Status (9)

Country Link
US (1) US3828187A (xx)
JP (1) JPS4953455A (xx)
BE (1) BE801716A (xx)
DE (1) DE2232247A1 (xx)
FR (1) FR2191260B1 (xx)
GB (1) GB1433807A (xx)
IT (1) IT990764B (xx)
LU (1) LU67895A1 (xx)
NL (1) NL7308958A (xx)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5381000A (en) * 1993-05-07 1995-01-10 Picker International, Inc. Image intensifier with modified aspect ratio

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5417865A (en) * 1977-07-11 1979-02-09 Nippon Telegr & Teleph Corp <Ntt> Hologram making apparatus
US4717893A (en) * 1984-05-04 1988-01-05 Hamamatsu Photonics Kabushiki Kaisha Spatial light modulator
JPH02304520A (ja) * 1989-05-19 1990-12-18 Hamamatsu Photonics Kk 空間光変調器

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3499157A (en) * 1964-08-18 1970-03-03 Nippon Electric Co Light intensity amplifying device utilizing a semiconductor electron-sensitive variable resistance layer
US3683185A (en) * 1969-08-08 1972-08-08 Nuclear Chicago Corp Radiation imaging apparatus
US3714439A (en) * 1966-08-18 1973-01-30 Itt Image comparison device and method

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL286467A (xx) * 1961-12-09
FR2098522A5 (xx) * 1970-07-17 1972-03-10 Electronique Appliquee
FR2139606B1 (xx) * 1971-03-31 1975-01-17 Labo Electronique Physique

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3499157A (en) * 1964-08-18 1970-03-03 Nippon Electric Co Light intensity amplifying device utilizing a semiconductor electron-sensitive variable resistance layer
US3714439A (en) * 1966-08-18 1973-01-30 Itt Image comparison device and method
US3683185A (en) * 1969-08-08 1972-08-08 Nuclear Chicago Corp Radiation imaging apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5381000A (en) * 1993-05-07 1995-01-10 Picker International, Inc. Image intensifier with modified aspect ratio

Also Published As

Publication number Publication date
NL7308958A (xx) 1974-01-02
IT990764B (it) 1975-07-10
BE801716A (fr) 1973-10-15
FR2191260A1 (xx) 1974-02-01
FR2191260B1 (xx) 1977-02-18
JPS4953455A (xx) 1974-05-24
LU67895A1 (xx) 1973-08-31
GB1433807A (en) 1976-04-28
DE2232247A1 (de) 1974-01-10

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